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Finding the Fourth Proportional to 136.47, 188.13 and 108.72

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Solution

The fourth proportional to 136.47, 188.13 and 108.72 is: 149.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.47 : 188.13 = 108.72 : x
  2. Step 2: Convert to fraction form
    136.47/188.13 = 108.72/x
  3. Step 3: Cross multiply
    136.47x = 188.13 × 108.72
  4. Step 4: Simplify right side
    136.47x = 20,453.49
  5. Step 5: Solve for x
    x = 20,453.49/136.47
  6. Step 6: Final answer
    x = 149.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.